Method of duplicating phonograms.



PATENTED SEPT. 25, 1906.

M. JOYCE.

APPLICATION FILED 0C'T.13.1897.

METHOD OF DUPLICATING PHONOGRAMS.

ELJE LC UNITED STATES PATENT OFFICE.

MAURICE JOYCE, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR; BY MESNE ASSIGNMENTS, TO NEV JERSEY PATENT COMPANY, OF .VVEST ORANGE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

METHOD OF DUPIJCATING PHONOGRAMS.

Specification of Letters Patent.

Patented Sept. 25, 1906.

Application filed October 13, 1897. Serial No. 655,027.

The obj ectof the invention is to reproduce facsimiles of phonogram-cylinders in as large numbers as may be desirable, and these cyl-- inders are reproduced according to this in vention in the manner hereinafter set forth.

Figure 1 is a side elevation of a phonogr'am with metallicend connections readyfor application to an electrodeposition apparatus. Fig. 2 is a broken cross-section ofaphonogram and one of the metallic end pieces and connections; Fig. 3, a face view of one metallic end piece. Fig. 41 is a broken longitudinal section of metallic mold-or shell; Fig. 5, a section of mold with all parts assembled and duplicate phonogram or wax therein.

The cylinder or phonogram..to be reproduced by this invention is the usual form of hollow wax cylinder, or it may be a come frustum having the characters impressed or indented in its outer surface. I take such a cylinder and make a metallic contact with both ends. Thus A indicates the original phonogram. B is a copper or other metallic piece having a hollow base or cup and a flat disk likeva cup-bottom against which the end' of the phonogram is applied. The edge of this cup is made tapering, as at B.

The cap C is somewhat similar to the base B; but as it is not necessary that this cap shall contain the retaining-nut no recess is required. The outer edge of this cap tapers at C, and the disk-face rests against the end of the phonogram. A metallic rod D passes through both end .pieces B and C, and all the parts are held firmly in contact by the ,nuts

D engaging threads on this rod. The upper end ofthe rod D has a metallic head E, to which the wire from an electric battery or machine is connected in usual manner, as by binding-screw F.

The parts having been, assembled, as in Fig. 1, a close-fittingwax joint is made between the wax 'phonogram A, and the metallicends B and C, and the surface of the 5 5 the bottom of the battery to insure good contact.

The battery fluid should come at least to the top of the cap C and referably extend above the same. By usualmeans of electrodeposition copper or other metal may now be deposited, and a hollow cylinder can 6 thus be made with its inner surface in contact with every part of the phonogram. An

" exact ,reproduction in reverse of the phonograin is thus made on the shell. This metallic shell I call-a mold. The flaring or 0 rounded -metallic end pieces B and C form, with the cylinder, a surface on which metal may be readilydeposited.

'The means for electrodepositingare old and well known. I assume no special noveltytherein, except, perhaps, for a convenient means'of holding a phonogram for use in a battery.

After the metal shell or mold has been ob tained the parts are disconnected and the Wax phonogram-cylinder A-is melted or removed, leavingthe copper or metal mold H Fig. 4, with the phonogram in reverse on its inner surface. The mold H is made with'tapering or'flaring' ends for the purpose of affol-ding a mouth into which melted wax can be oured. One flaring end is cut oif the mol d; but by having two flaring or cupped ends that one can be selected which is most desirable. After cutting off one of the ends theoutside of that end of the mold is trued up in a lathe to exactly fit a base or holder I, in which a holdin -cup is made, or if an exact fit be not made t e mold H may be held in base I by a filling of wax or plaster, so that the 5 mold is held firmly. A tapering core K, pref erably tubular, has one end cylindrical and screw-threaded, and this screw-threaded end enters a socket in the base-piece I, so that the core is exactlycentral of the mold H. The ICC mold, core, and base are slightly oiled and then heated, preferably, to near the temperature of meltedwax. This heating expands mold H slightly. Then melted wax L is poured into the hot mold and fills the s ace etween the mold H and the core K. ter

55= "1. (The processof'making phonograph-cyl the wax has been poured it will generally havethe exact form of the mold when cool but under certain circumstances the wax cast I may be subjected to pressure in any of the usual ways. A hydraulic, pneumatic, or other pressure may be applied to the wax column, as isdone i'ncasting metals A good way to apply pressure, however, is to Wait V until the: wax has partly set and then screw not only compresses, but expands the wax outwardly, insuring that all parts of the mold are imressed into and reproduced. by the wax. he. mold andrcontents may now be cooled by immersing all in a bath of cold water, or cold water maybe passed through the hollow core K, or other cooling means may be employed. The cooling of the wax, which 'is -of usual 'phonogram compound, causes it 'to shrink away from mold H,.and the wax du'licate phono ram can now be removed rom the end 0 themold, the shrink-' age ,being great enough to permit this removal without injury to the phonogram-rec- 2 5 0rd by direct longitudinal movement of the phonogram. By a repetition of the molding process-multiplied copiescan be obtained to any extent." a 7 'he core is preferably withdrawn from'the mold with .the phonogram adhering thereto. 'Then'the core may be removed and the ends of the phonogram dressed up,,'so that the new phonogram is an exact reproduction of the original, .011 the core may be permanently 5 left in the phonogram. v

' I have described a method and mechanisms for. carrying the same into effect in the'best I mannenknown. to me."-.It must be understoo'd thatII avail. myself'of the mechanical v inventionui as broad 'as Lmy claim.-

Wher'eZ-I have'lndicated a wax phonogram' it must be understoodas applying to a-phonogram -of* plastic material When i refer to "black'leading,".otherpianductive materials used as an e ,uivalent injthe eleetrotypers art may 176 ,1156 instead of graphite. My dupli- 5o' cates maybe made of any" fusible substance usedfor phonograms, provided the shrinking of the material orthe expansion of the metallic shell permits the withdrawal of the duplicate- .from' the. mold! What]; claim isiriderswvhrch consists in intruducingmolten down thetapering core into its base I. This substantially as set forth. 1

'ords' in wax-like jmaterial, whic material into a mold having a hollow core,

and applying cold to the inner surface of the core-by immersion of the mold, substantially as set forth.

2. The process of making phonograph-Tecords which consists in introducin molten material .into a mold having a hol ow core,

andapplying cold to the outer surface of the mold and inner surface of the core, substantially as described;

3. The process of duplicating sound-rec cords in wax-like material which consists in casting within a hot, seamless, tubular record-mold, fused wa-x-likematerial at substantially the same temperature as the mold,

cooling the mold and contents so as to cause the material to shrink away from the surface ord-mold, fused wax-like material at substantially the same temperature as the mold, allowing the material to set, cooling the mold and contents so as to cause the material'to shrink away from the record-surface of the mold,;.and removing the hardened casting longitudinally from the mold, substantially as set forth.

5. The process of duplicating-sound-recordsin wax-like material, which consists in casting within a hot, seamless,tubular recordmold fused wax-like material at substantially the same temperature as the mold,a'llowing the material to set, applyin pressure to the set materiahcooling the mo dand contents so as to cause the material to shrink away from'the surfacefof the mold,- and removing the har-J dened casting longitudinally from the mold,

sound-rec 6. The process of duplicatin consists in castingwithin ahot, seamless, tubular record-mold, fused wax-like material at substantially the same temperature as the mold, placing the mold in a water-bathand removmg the hardened casting longitudinally fro the mold, substantially as set forth. e

. In testimony whereof I affix my signature in presence of two witnesses.

' -MAURICE JOYCE.

Witnesses:

THOMAS J. STALEY, W.-A. BARTLETT. 

